Why does a pigeon have an exoskeleton?

How many years a lovebirds can live? Why do pelicans live in Florida? What layer do birds of paradise live in? Where do ducks liver? There were 9 ducks and 8 geese on the pond then some of the ducks flew away how many duck are left? What is the only bird known to kill people.? Is there any animal which lay eggs and also give milk? How much does a great horned owl eat in a day? What type of cattle is a Bradford? What are their names of birds are derogatory when appeal to humans? What do snakes eat while kept in captivity? Would you die if you licked bird droppings? Why does your lovebird throw up? What are some adaptations related to fight in birds? How long do rheas live? What bird makes an untidy nest? Do geese return to their birthplace? How does a screech owl raise its young? Is a roc a mythical bird? How long does it take for a bird to hatch when there are already cracks on the egg and it is ready to come out?